ggVennDiagram: ellipse – R documentation

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ellipse

generating a closed ellipse

Description

This function is derived from 'VennDiagram::ell2poly', we modified it and then it can generating a closed ellipse, which is a requirement for further transformation to a POLYGON sf object.

Usage

ellipse(x = 0, y = 0, a = 2, b = 1, rotation = 0, n = 100)

Arguments

`x, y`	the coordinates of ellipse center
`a`	radius of short arm
`b`	radius of long arm
`rotation`	rotation in degree
`n`	number of points

Value

a matrix representing ellipse coordinates

Examples

# plot the default ellipse
library(sf)
library(ggVennDiagram)
ellipse() %>% st_linestring() %>% plot()

ggVennDiagram

A 'ggplot2' Implement of Venn Diagram

v1.1.0

GPL-3

Authors

Chun-Hui Gao [aut, cre] (<https://orcid.org/0000-0002-1445-7939>), Guangchuang Yu [ctb] (<https://orcid.org/0000-0002-6485-8781>), Adrian Dusa [ctb]

Initial release